✅ What deposit and rates do HMO mortgages have?
Deposits scale with the property: small HMOs (up to 6 tenants, standard layout, outside Article 4) from 15–25%; standard specialist products at 25% minimum (up to 80% LTV for experienced landlords); large 7+ bed and Sui Generis properties 15–40% on more commercial valuations. Rates run 0.5%–1.5% above standard BTL — and the maths matters: a 0.3% premium on £250,000 costs ~£750 a year, which HMO yields usually repay many times over. Income is assessed room by room, often lifting borrowing above an equivalent single let; licensing is checked as standard; credit standards run stricter than BTL. Money Pilot compares the specialist HMO market across 200+ lenders at zero broker fees — FCA regulated (FRN: 968705).
Right, if you’re looking into HMO mortgages, I’d guess you’ve already worked out the basic appeal, better yields than a standard single-let. What I want to do here is give you the actual numbers, deposits, rates, income requirements, so you can go into this with realistic expectations rather than a rough sense of “it’s a bit different.”
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What is an HMO mortgage?
An HMO mortgage is a specialist type of buy-to-let finance for properties let to three or more unrelated tenants sharing facilities like a kitchen or bathroom, a House in Multiple Occupation. Because HMOs carry different risks and regulatory requirements than a standard single-let, most mainstream lenders won’t touch them, you need a specialist HMO lender instead.
How much deposit do you actually need?
This is where it genuinely varies more than people expect, and it comes down to the size of the HMO:
- Small HMOs (generally up to 6 tenants), with a standard residential layout, outside Article 4 restricted areas: often 15-25% deposit, and in some cases can even be funded under standard buy-to-let products, which can reduce both the deposit and the rate.
- Standard specialist HMO products: most lenders want a minimum 25% deposit (75% LTV), with some going up to 80% LTV for experienced landlords.
- Large HMOs (7+ bedrooms) and Sui Generis properties: typically 15-40% deposit, assessed on a more commercial or yield-based valuation basis, since resale as a standard residential property becomes harder.
My top tip: if you can stretch your deposit from 25% to 30-35%, do it if you possibly can. It genuinely unlocks a wider range of products and noticeably better rates, not just a marginal improvement.
What rate can you expect?
HMO mortgage rates typically run 0.5% to 1.5% higher than an equivalent standard buy-to-let product. That sounds like bad news until you actually run the numbers alongside the income difference.
Here’s the bit that actually matters: a 0.3% rate premium on a £250,000 HMO mortgage costs roughly £750 a year in extra interest. The same property, let as an HMO generating say £2,000 a month, versus £1,100 a month as a single-let, produces around £10,800 more income a year. The rate premium is almost always dwarfed by the yield advantage of the HMO structure itself. Don’t let the higher headline rate put you off without doing this comparison first.
How is your income actually assessed?
HMO lenders calculate rental income room by room, not as a single whole-property figure, which often results in a higher total eligible borrowing amount than an equivalent single-let assessment would produce. Most lenders then apply an Interest Coverage Ratio (ICR) or Debt Service Coverage Ratio (DSCR) requirement, wanting the total rental income to cover 125-145% of the mortgage payment, calculated at a stress-tested rate, commonly around 5.5%, well above whatever rate you’re actually being offered.
Some lenders also want to see personal income outside the rental itself, commonly around £25,000 a year, as an additional safety net, though this varies by lender.
Does licensing affect your mortgage application?
Yes, directly. HMO licensing status is one of the things lenders check as standard, and most require either a valid licence already in place or clear evidence that one is being applied for. If your property sits in an Article 4 area, where permitted development rights for HMO conversion have been removed, you’ll need full planning permission too, which lenders will want confirmed before proceeding.
What documents will you need?
Typically:
- Photo ID and proof of address
- Recent bank statements, commonly the last 3 months
- Proof of income, payslips, SA302 tax calculations, or company accounts depending on your structure
- Evidence of your deposit, and where it’s come from
Can first-time landlords get an HMO mortgage?
Yes, though the maximum LTV is often slightly more restrictive. Some lenders offer up to 80% LTV to both first-time landlords (someone who owns their own home but no rental property yet) and experienced landlords, but genuine first-time buyers, people who’ve never owned any property at all, are usually capped at 75% LTV, needing a 25% deposit minimum.
Does credit history matter more for HMO mortgages?
Generally, yes. HMO lenders tend to look for a clean credit profile more strictly than standard buy-to-let lenders, reflecting the additional complexity of the property type. Some specialist lenders will still consider minor historic credit issues, but recent problems typically lead to either a decline or a noticeably higher rate.
Should you compare on headline rate alone?
No, and this genuinely catches people out. The lowest advertised rate often carries the highest arrangement fee, so two products with different headline rates can end up costing almost the same, or even reverse in ranking, once fees are factored in over the product term. Always compare the true total cost, not just the percentage.
The bottom line
HMO mortgages typically need a 20-35% deposit and carry a rate premium of 0.5-1.5% over standard buy-to-let, but that premium is almost always outweighed by the considerably stronger rental income HMOs generate through room-by-room letting. Get your licensing sorted, your deposit as high as you can realistically manage, and compare true cost rather than headline rate, and the maths behind an HMO investment usually stacks up in your favour. Given how much lender criteria vary on exactly this product, comparing across a genuinely wide specialist panel, rather than the first HMO lender you find, is where the real difference in your final rate gets made.
